摘要
球磨机中磨球的冲击应力对磨球和衬板的选材设计来说非常重要。文中提出了确定球磨机中磨球最大冲击应力的方法。该方法包括测试方法和计算方法。首先用所设计的落球试验装置模拟球磨机中磨球的冲击，测试不同直径磨球不同落球高度时磨球冲击接触面最大直径。根据测试结果判定球磨机中磨球的冲击为弹塑性接触性质。然后运用弹塑性力学推导出了应力计算公式：在直径为Ｄ的球磨机中，无磨料时球－球最大冲击应力为σｍａｘ／ＧＰａ＝３．３８（Ｄ／ｍ）０．１６；有磨料时为σｍａｘ／ＧＰａ＝ ３． ２０（Ｄ／ｍ）０．１６当磨球与衬板材料相同时球－衬板最大冲击应力为球－球最大冲击应力的０．７倍。
Impact stresses of balls in ball mills are very important for selecting or designing materials of balls and liners. A method of predicting the impact stresses is presented. The method includes a series of measurements and calculations. A ball-falling 'impact device is designed to simulate impacts occurring in ball mills. Measurements of the balls' contact area are done at different fall heights for different diameters of balls, either with or without ore existing. Character of ball-on-ball impact is determined as elastic-plastic according to the measurement results. Formulas are induced to calculating the maximum impact stresses in ball mills based on elastic-plastic contact mechamics. The maximum ball-on-ball impact stress is σmax./GPa = 3. 38 (D/m)0. 16 with no ore existing and din./GPa = 3. 20 (D/m)0. 16 with ore existing, where D is the diameter of the ball milli the maximum ball-on-liner impact stress is about 0. 7 times the maximum ball-on-ball impact stress.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1996年第4期87-92,共6页
Journal of Tsinghua University(Science and Technology)
